CI: deploy release version to a preprod region

[bayandin]

Problem

We want to deploy releases to a preprod region first to perform required checks

Summary of changes

• Deploy release-XXX docker tag to a preprod region.

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

2730 tests run: 2598 passed, 0 failed, 132 skipped (full report)

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Flaky tests (4)

Postgres 15

• test_ts_of_lsn_api: debug
• test_sharding_split_smoke: debug
• test_empty_tenant_size: debug

Postgres 14

• test_sharding_split_smoke: release

Code coverage* (full report)

• functions: 28.2% (7207 of 25518 functions)
• lines: 46.9% (44238 of 94368 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
67d94c8 at 2024-03-21T14:38:20.158Z :recycle:}

[jcsp]

Does this mean that we'll need to pause staging deploys to this region while testing the release, or will this region only run releases, and we'll need to use the US staging region for testing changes that didn't make it to a release yet?

[bayandin]

will this region only run releases, and we'll need to use the US staging region for testing changes that didn't make it to a release yet?

⬆️ This is the current approach